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Title:
Observations of colocated optical and radar aurora
Authors:
Bahcivan, H.; Hysell, D. L.; Lummerzheim, D.; Larsen, M. F.; Pfaff, R. F.
Affiliation:
AA(Center for Geospace Studies, SRI International, Menlo Park, California, USA); AB(Earth and Atmospheric Sciences, Cornell University, Ithaca, New York, USA); AC(Geophysical Institute, University of Alaska, Fairbanks, Alaska, USA); AD(Department of Physics and Astronomy, Clemson University, Clemson, South Carolina, USA); AE(NASA Goddard Space Flight Center, Greenbelt, Maryland, USA)
Publication:
Journal of Geophysical Research, Volume 111, Issue A12, CiteID A12308 (JGRA Homepage)
Publication Date:
12/2006
Origin:
AGU
AGU Keywords:
Ionosphere: Plasma waves and instabilities (2772), Ionosphere: Ionospheric irregularities, Ionosphere: Electric fields (2712), Ionosphere: Auroral ionosphere (2704)
Abstract Copyright:
(c) 2006: American Geophysical Union
DOI:
10.1029/2006JA011923
Bibliographic Code:
2006JGRA..11112308B

Abstract

This article presents case studies of common volume observations of the E region radar aurora obtained with a 30 MHz imaging radar and the optical aurora (green line emissions) recorded by an all sky camera. In addition, in situ rocket electric field measurements in the vicinity of an auroral arc are presented in a separate case study. As inferred from the measurements, the radar aurora in the vicinity of a stable evening auroral arc arises because of the arc's polarization electric fields, which excite the two stream instability and generate electron density irregularities at meter scales. The radar aurora is the backscattering of radar waves from these irregularities.
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